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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d82f3e99d7e38dd97f6351e843c06aebc9fe24edd9895e36738817b013bbac0' 
  AND token = 'rseBAb2g1B36MJpoOnvgTLTE4Bys2J8MHftK2CaUNBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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