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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ab63c8b9db6a6162d4e25e7a948a3d1a9d90c82b10fc38dc5c571c5fd2175a4' 
  AND token = 'w8BgJdPiBCLc3eEOxPptMLIdP4L+aC02Gj6yXIdugF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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