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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f15e6ef2ddba06cd0b1be77e81c61feda2b0f2c7774e5f08ad6ac3c10d7a51cf' 
  AND token = 'B+0LV7QlX4pE6eFYiGMnpI58pcqlLftGyTWFFH1S+sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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