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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '463e84579978026b65398304fb63bdcbf0c43eeb04566d9b1dff1a1095979d54' 
  AND token = '3Fo+EdIwt3rlpw3AwOoiYMtwGXpsotdTd5za40b60ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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