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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7453da91b74372f09012701bfdab7c64a5b534b1327662f52ae095a297674a7' 
  AND token = '2F6I1aX4DI2Wl5ccC14xyxM6Sptw6HQwfPOF6YFn734=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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