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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e8bafaad12896d3ababd8b706483bdc0cb21e0bf8272b3ccbdafa28f0d16e1' 
  AND token = '+JpvVAKj8JCQn6r5tc64rV+Ub0A4Sb8FCDa8pSEMjhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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