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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa014b14e947406bb620f09082ec22d619b32a0b5f978f20d182b1f00a311798' 
  AND token = 'SsWaYS5N1tMrmEB6tPNyXjcDV4tmPHU2qoLhxCpi7nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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