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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46199a3281c74f5dc47f138852c9b3d89caac71420e461e2a28415452ec5e463' 
  AND token = 'zvC9auHvt9VaUy19A1CL5yQ50iSiEErvh8gEwfZ4Yc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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