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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81ade3867b259499d17c52c3f34976fbce75d8ce94aa3ca61842b537e225b8a2' 
  AND token = 'wbs5ftlSdBiMY+AfzQfniw6NHbKe9tcm7WW+mCp9Bh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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