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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '102e1b7e818eb7ab6b0d61d5ea44e488c539f3b8eb7c8ded60b5ddcc7b9bba43' 
  AND token = 'jPRBpo+7NLkckjXbf5jx37wKlmleXf4G26RP55KPNAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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