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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0877c8f081cf113bc5b48c8b5ead791a725785b97fdfced7874cb8a3cdf35865' 
  AND token = 'ed+FWo4NO1PAH5iWbKGFrQyyS/FbiZRfuQwi0TRayU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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