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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76bef3fe371598e906592ddbea2dd47aff6ad41d95199d49341b367c6a6a1a6e' 
  AND token = 'hNSd8tOmkqK5EEMk8J99ujfmxBEH5CQCaE39NJJ6/cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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