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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3942877e492d6edf7eec262b440ca0c4580283a4538a194dad10eb8a82fa9d25' 
  AND token = '4SjRHw3YsuozO060VMzPeWwZCF1WaLSOYZ7Ec9xwx/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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