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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b06e8e724b3d0c12e38e7d7b60d1ad488b38a939416dc8a92b510aca82429f' 
  AND token = '5IuotsvmrUX4mSJaTmR7Di8NUVhokR+ql6l4WmQC450=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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