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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a1d77bfa51ef6241c80ec61e888e94840c4148faee216c352cfb5e20fa4ef56' 
  AND token = '4IN+X8k1GDEZKvV+eXr0ZmZKxsiB/Ez3D3I0WB7j3uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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