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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76823681a4273b941a78f4bee48c95450d05949222a9a9a3fcc1545a8f4bd6fb' 
  AND token = 'vwmEdqqR94mHyPK0NAjyc/H25d2w02GvB8gqBrQQwGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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