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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f604793d435b36512b05209f6f4b157ee4fe62eb924ef890b2f667aa405777ae' 
  AND token = 'iAWVaFBiPJnhwhgylpQNhY/XfUehaY4msXRybaGTZQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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