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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e373f00d81d29e762c0a3ce31d3d3d07ad6700f56526df5838183eca9abddc7' 
  AND token = 'IXgxQkL4032tMkCyW16Vrik2Foruzp/8wzM81VuwU64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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