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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7d2e87f0a799faf23478c7c023a5ce770d061db688ce91e1a7236dd8dc783d1' 
  AND token = '1opz3f6/9uxq8BpsL7ReX4jOqx4e7dqDoUR8HZl0JCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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