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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69c963eb25553e6efd83eb0463da835c8c7469277e1e6b2ec06b6a41f75b2a80' 
  AND token = 'dtAv+E6eltS8/9RvPd65bkvAxsmilVH+iNKuT0MV0Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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