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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59f276829bb3396a126fc2bef21fc3d61dfa3c274e53a6a3c782e1cfde2e8622' 
  AND token = 'aJBnWgX7zA1E3qASR4cL2Tp5Exk8It7B1r95PKlByM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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