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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37386764ffc9ba91382c2728fa14f98af8f10fb458143a7580ac67886145f0f0' 
  AND token = 'iRlS4D5Dj2p5JY9bKRzEPHu1wBaEBBrW3ro2SBrDNBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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