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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ac5b2c9167fc5a79c3281c978ce6044a9f457da4a3c0b9eec9733d0f6dfe2cd' 
  AND token = '9hmLg2jsb3DPKS11FNbpAExJWHYyHtxR2MUzMsJ23Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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