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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c268fcea9e91cfa9d59ed124d50e8b55ed4ac43048360f840f4f24d8af053d63' 
  AND token = 'wuCWhwkpNYelNE9HwEKFTAmGR9X6ozqdyVmcB9I0l0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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