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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd01ddefbef0602147029ab57f48049ca85c6e887eba8a7b1bbed6c2b986ce4' 
  AND token = '6KF5bhv7SXIJrXHlJWzi2LEpcQlSJDiCBaW9rRpPU+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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