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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3511a77e75debbc63e9f887cef9c8fa027e4f675e0125b86ce763f0b7e832aa' 
  AND token = 'GS+LnBlemcps5V2tm2cRrQgwJVRciM+uNICKXqXnG7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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