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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f458dc69140cb9730140a970cd6f1ad9bb39ec2f10f76d5b0aba5088d3a1f2e9' 
  AND token = 'cg5dNXl1bSESLcTcoIqKPk+WHi9j8tmjBcV96IUVLBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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