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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f1dbb67006e49e96ff6b32b7f9672a2afbfbfeb8d57fa9fb073a6d7bde54037' 
  AND token = 'zgd4mshtF/pW4Dsfl4jChJNKcmm8khpkkssenubEkcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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