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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f026ed10c45b9c0bdeb36b6c90cf3e33fd68eda2e91e8cf41aa2f2090b37ce32' 
  AND token = 'q1bb+HoFJAAes89YVsB4zF5yyMqd8ZHe9YKGAL+ptsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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