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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '958327d89f22e0aad1ce226d43cd36071fc65ea9b8f0c44b8abdfa72a013d6ec' 
  AND token = 'Iedr2ForGECG2+OjONt0SxJ+jdCENOAtrV+mQq19lbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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