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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aabd814fd3bef67d3f70f1537b60cc28134d66a0d3386ddaa05277ad0d22098' 
  AND token = 'zcjGzvZLiyO0x9Ic1+hkWRUsoXeArGervfgniEufHF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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