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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd881ad3c1f90ce6fc3a55e740d3ebf262cebf9b8806115fb83bf6fc0e5db8ae' 
  AND token = 'Khr7CFDSR9WIxwx4p4n8ujSIuZUH6bLdmBoARbxping=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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