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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0864d862aeccd5f62920c5d69f7dca71b0d29950832f5c1991d028ab0c87ddd' 
  AND token = 'Enzf51W/elcPgSZCwUYByJte0uSwYaamXcpCIuy0jfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00094

JSON explain

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