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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '217cba0c509b7b08d2b2ac096fc7a0b9c07a2a052cb9b16ef17e3cbe6d604e17' 
  AND token = '5jUt90jbCztwgggSAhwRPMNnZkHxvv2UaIz8Whsd8og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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