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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75aa0032762ce437ca912b410e25489212ceb9009ffe562725c3b932de8911ce' 
  AND token = 's6hVi8Pngb3EW2FqXdT6JNMXSzGnUTWKhkc0Pkq8w8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}