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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38b4af15da0e09267820e064b6aceb586f5371b5fa8f320a402b41d567445a16' 
  AND token = 'Om7aJNoo35PeDWBpqbZ+Ct7CHXHLovp7AiYCv3PO2k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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