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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca46eee54c76dda6e2940a3482c10d3a021aca68843800ca7ccaae7cd72c426e' 
  AND token = 'pnEXxWPm90AueCHdz8oqJnLr231P9PnIQIdjHSa6UYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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