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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '756b2c4eeaa5c567cf359d486d29319f29072fdd84044b135fe521541fd21a2e' 
  AND token = '9u5MLba/A7EMt5xxssNXWjt4meWmXRRmJeXxfi4VBeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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