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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '769efe13dd08ab88d6ad12c6513f17a657254d30cf47c84edf8134f09e42fd43' 
  AND token = 'Ayjx762NLYvPFkgL7XOBRopUNINa2XFVwo07vIuVb4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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