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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ab04df80d84a64fa3a4b0e043af8fbdd126bace000453391dfd714850ab5ee3' 
  AND token = 'RsUZa+IGGRtcLs26ZANeo0x7e3W3ODF4X1mJotH1I2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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