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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '155d95a18965049e054ac45b03c727a3cacd4f836a389f8e8cc951bcc4c4fee1' 
  AND token = 'DnP/XeEwwMMlflBx+HzOQ4EIQ2jX4AIBVBpuj2Us8Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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