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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c3af6552ced824d6007873a130a210bef0a2018b94348de01007fcc3317fb6d' 
  AND token = 'pEacFH/fUWauqBN5P+5CYZVqRaqu7Eg36s/n/mSydDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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