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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fb4b1815ebd1a0f0c1397969d2cee862ec48af912796bbc8845cfe6401e84c0' 
  AND token = 'a6RnaPa192E8/KVrgBr5O4SSel18oMsO9xBNprrmPdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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