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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62440048e1e23a95258faef9432a87d678ad250d7444c6f78c75dccefbb50cff' 
  AND token = 'Hpg/KrQeC0+IGCpX25Xz/sz0Y5BxWFo/t8rkGl4CQnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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