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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '928c4726711e605e3b2ddc4bf32d1e7a932faf7aba6e5b70a54f6bad435a4a6b' 
  AND token = 'jhEXyBXhkCBsvrEozD2aBXBeOsuG4OOSD2moC74mK7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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