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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cd4a3bbfa24c0b99a86adbcbb28d5bf0c4c0a62827b7455e5f5c6f67411702c' 
  AND token = 'tAOJggnOw0Co8kKtqcZNuc0R4Tb3Y2lYhA/c3YXuM1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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