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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4df3541678a54baa7eba3d5abbd245e3ab0821036336246cf4dadabf82f45dd' 
  AND token = 'dnS0+slcYpEe347eak3LeFM1YU3QcXosj8vIfweU8/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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