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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45f9d3cb36c404384b03268f1e8a16cc025b241c78655ce1243d00350e0f40bc' 
  AND token = 'WNercI4Mnk59igO1Efq/Iz5rXfGC+cK7XRfzVXat94s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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