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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7c62a991cc9ecdefc2d6dd15a1c609d930db64bfc93485dbf79c2e8bb93bfff' 
  AND token = 'AATP8aG+X4re3Pkxv9V4SE6K44O9kgKpZDyucoIfluU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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