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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2bb64376032bd34b05ff3df8850d3797b6d04ca61db2945e16ffd6c72d8df8a' 
  AND token = 'sicKneU0fu2+2NGODtkVLAh2SWaOG0ADb94i6Gomkj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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