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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '188a42f6703d48ad10326a52ab411fc6f912eaa81ef37e973ba84270aa08940f' 
  AND token = '/iLNwwta19oRCFhnzIu5alVGstHfq5mA6W42uR8N0Dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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