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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34cc290741f69f6628db33d368ba84041da698d44fc71783bb986106dee1b6ee' 
  AND token = '/CsQWsI1zPG8dLWx2exzMA9spc8/Kwci6YNvbyuAFc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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