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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93fa72580c3cf48a26d1ba6ac3f10cab77b0bbc69635e89e21d55ad882f0026e' 
  AND token = '8gBuZx3p66zaHp4sTQh87HCwsnyEyLB+VXg7v2eKMRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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