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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b15c65e439359283f1db5f4072b153d8cb7e25681b2138ebf91af02065a5551' 
  AND token = '4MuaabasI+cYWEiPub8ISQ441dMKP11l/iIOXVPLZPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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