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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc52e0b4fbccf6c9d32c299bf1260282b5fbbba8eb6f4c313dd4c65c372571c9' 
  AND token = 'RD4U7rLPfAXJ+OFmILhYZe1mel6OROSEJNHtdEbYPlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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