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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4708067971f37ae94f9c153e220e83079d6bea3205fddc5d9cc3a49afcbeb481' 
  AND token = 'A4Yvo0/5pla5cT9wTg6mp2rreQm0hvTURivCcun69lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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