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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db3f91008b9902376d0b64c88a2011c2421e0294f7b326f77422673c12057fd2' 
  AND token = 'TUihTqtK7k6njJa5OWkY9TSbLToKWo8VjYPEE98SLy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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