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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6ab59ccf7f4678038c5cac362c7d86fef66713650eafac072c2df8f8c943937' 
  AND token = 'okn4gDM4O/HboVaqxsLPN3E0RMwvHb3P/ZIWRkSm9PM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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