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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9533cd061e55576aa8435ec7bc7b22e899d558d5e125f82a293d793869845bd7' 
  AND token = 'fpEE2TsDucRz5QbGT/IrP4mWUM4TM60byF/DfvvXK9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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