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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e582b9476f061df3fddc60bd77f1bc476522814cdfc4f88c27ca681806f51ce5' 
  AND token = '1hGdWuYQNncQ/2ibGj+1Z1KQYPA0P7TewhNhoLFsoaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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