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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba082ec0cc8886b0ff9432c1285f1dcd269903e5e4f7db695c706f6f28d4b710' 
  AND token = 'C4pbIZMIM0csU+nN4vckxx/+GNLyAXweWXt04LLqxZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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