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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3448072eb0f119dbc8fb6c6be631bfef362f043c7798858d7fd1ddaca91c4ad8' 
  AND token = '3e4igMS6i37z8AKsbFt+/ZGnYiqdDnzbR4JnNNXlv6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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