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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f373c2554cd83324b23a52b7042dfea185672a89c0ded0429664ea01dfcb98f' 
  AND token = 'aJIYD9vsSJekmAPvKbjxOAyFpdok0j7HfBRalznNBO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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