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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67409e54ea0ddaa1c7e0c1395cef159796d177a4cd3fb32a949cbc3e88d67ef2' 
  AND token = 'n5IDLpnwXijTUWa6VdC3k/Dk1cPlklPUTl/aES83Fp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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