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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92084f2c7d981322cac40c11c8cf723c692828591fa2054c56705cc619980487' 
  AND token = 'p1qO++0Nc5D61n+l9+AivLIVvsQrJtuNiPxE6h+A7y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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