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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dc7ba8030953998e8c4bad299a258a2e99e61e57a98cf3b8755655f98c14cf9' 
  AND token = '4p5zGEkyKbx+y2cOM+R79e+jhB5BRWgl2CUd5OCfaZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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