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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f90088168afa626abd70662303249db708fce31085c532ffcf345f87d81958ed' 
  AND token = 'VJ5EoG1H5ajASB9EoLrs3giGwzV68ad/8Iu+llQezbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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