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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99220c8c071d2d23d806a376a52c22d8fe710602fc3f9211c4f45aedc014d5db' 
  AND token = 'NkoyvdWLc+8GXxZe8Osq/nagVPXz8FaX7iQsrxTzh60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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