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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '515ce390744df709d99f277739c2d252c5b5b4a17e8d9acc2b91c7138689a6bf' 
  AND token = 'AAxVQbPOwEyGmyJtl6tVIi9vlig85rA+9fcH1LXoHCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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